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Carbon Nanotube Based Robust and Flexible Solid-State Supercapacitor.

Thushani De Silva1, Cole Damery1, Rana Alkhaldi1

  • 1Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, United States.

ACS Applied Materials & Interfaces
|November 18, 2021
PubMed
Summary

Researchers developed flexible solid-state electrochemical double-layer capacitors (EDLCs) using aligned carbon nanotubes. These robust devices offer high energy storage for wearable electronics and maintain performance under bending and varying temperatures.

Keywords:
carbon nanotubescharge storageelectrochemical double layerpolymer gel electrolytesolid-state supercapacitor

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All solid-state flexible electrochemical double-layer capacitors (EDLCs) are essential for powering wearable electronics and bendable micro/nanotechnology.
  • Existing flexible EDLCs often face challenges with mechanical robustness and maintaining performance under stress.

Purpose of the Study:

  • To develop robust, flexible, all solid-state EDLCs with enhanced energy storage capabilities.
  • To investigate the performance and stability of these devices under various mechanical and thermal conditions.

Main Methods:

  • Fabrication of EDLCs using aligned multiwalled carbon nanotubes (MWCNTs) grown on thin metal foils.
  • Integration of MWCNTs within a poly(vinyl alcohol)/phosphoric acid (PVA/H3PO4) polymer gel electrolyte and separator.
  • Testing device performance under static, flexed, and cyclic bending conditions, as well as across a temperature range.

Main Results:

  • Achieved high areal specific capacitance (∼14.5 mF cm−2) and energy density (∼1 μW h cm−2), surpassing many existing flexible EDLCs.
  • Demonstrated excellent mechanical robustness and flexibility, with no loss of capacity under flexed conditions and stability over ~2500 bending cycles.
  • Devices maintained functionality across a temperature range of 20 to 70 °C.

Conclusions:

  • The developed aligned MWCNT-based flexible EDLCs offer a promising solution for high-performance, durable energy storage in flexible electronic applications.
  • Strategies like device stacking and thermal annealing can further enhance capacitive charge storage.
  • These findings significantly advance the development of robust, stackable, and flexible all solid-state supercapacitors.